Improvement in fastenings tor frtjit-jars



Fruit-Jar Cover. 110.101,958. Patented Apr,i112,1870.`

Y vented certain Improvements in Cthritrrl ,tttre THEODORE F. WOODWARD,0F WIN-SLOW, JERSEY,

AssIeNoR 'ro HAY & CO., 0F PHILADELPHIA, PEINSYLVANIA.

Letters Patent No. 101,95S, dated April 12, 17

IMPROVEMENT IN 'ASTENINGS FOR FRUIT-JARS.

The Schedule referred to in these I .etters Patent and. making part ofthe same.

I, Tnnononn F. WooDwAnD, of Winslow, in the county of Camden and Stateof New Jersey, have in- Covers for Fruit-- Jals, of which the followingis a specification.

The nature of my invention consists in the construction ofthe cover witha central recess, and combining therewith a spring upon which thetighteningscrew of the clamp presses in such a manner as to admit of thecover being sutiieiently raised by the expansion of the air in the jar,when the latter is filled with fluit and heated, to allow the escape otthe air. IVhen the air has escaped, the cover, by the action ofthe'spring, is again brought tight upon the gum packing-1'i11g, makingthe jar air-tight for the preservation of the fruit.

To enable others skilled in -the art to which my improvement appertainsto make and tion, I will now give a detailed description thereof'.

In the accompanying drawings, which make a part of this specicationlFigure 1 is a vertical section ot' a jar, with the improved cover inposition.

Figure@ is a top or plan view of the cover I3.

-Figure 3 is an edge view ofthe same.

Like letters in all the iigures indicate the same parts.

A, fig. 1, is the jar. v

B is the cover ofthe same.-

C is a clamp, having a tightening thumb-screw, D, for pressing theannular rim a of the cover tight upon the gum packing-ring E, which islocated on the flange b of the jar.

The cover B has a recess, c, in the vertical projection d, whichreceivesl the spring F. l

On the upper end of the spring, the end of the thiunb-scrcw D presses intightening the-cover.

The object of the spring is to vadmit of' the cover being slightlyraised bythe expansion of the air in the jar, when it is filled withfruit and heated in the usual manner of canning fruit, thus allowing theair to escape 4from the tight onthe packing ring, when the force of theair is spent, and thus sealing the jar for the preservation of' thefruit.

I do not confine myself' to the use ot' a wire spring, F, as other formsot' metallic springs may be used and answer the purpose; or a. piece ofgum or other yielding material may take the place of the metallicspring.

As freeing the fruit of air as much as possible is known to be ot` greatimportance to its preservation, it will plainly appear that the deviceabove described heilig both simple and well adapted to the purpose, isof much utility. l

rlhe cover B lnay be made either of glass or metal, to suit the viewsofthe manufacturer.

What I claim as new and desire vto secure by Letters Patent, is-

The combination and arrangement of the jar A, cover B, having `a recess,c, provided with a spring, F, the clamp C, screw I), and packing-ring E,substantially as and for the purpose above set forth.

1n testimony that the above is my invention, I have hereunto set my handand atlixed my seal this 23d day of February, 1870.

THEODORI) F. WOODWARD. [u 5.]

Witnesses Giras. I. wns'rco'r'r,

B. C. VANAAIAN.

jar, the spring forcing the cover

